Tonguing and grooving apparatus



July 31, 1928. I 1 ,678,784

' W. OHNO TONGUING AND GROOVING APPARATUS Filed July 9, 1927 PatentedJuly 31, 1928.

Wires STATES WILHELM OHNO, OF SEEBACH-ZURIOH, SWITZERLAND.

TONGUING AND GBOOVING APPARATUS.

Application filed. July 9, 1927. Serial No. 204,609.

This invention relates to a tonguingand grooving apparatus by whichtongues and grooves of different widths can be produced. The tongues andgrooves madeby this ma chine are so accurate and clean that no finishingwork is required.

An embodiment of the invention is shown, by way of example, in theaccompanying drawing in which:

1 Fig. 1 shows the tonguing and groovingapparatus in cross section.

Fig. 2 shows in elevation partly in section the cutting-blades.

Fig. 3 shows in elevation a threaded cylinder.

Fig. 4 shows the tonguingand grooving apparatus in top-plan view, thecasing being removed.

The touguingand grooving apparatus comprises a casing composed of twoparts 1, 2, which are guided the one on the other by means of pins 3.These pins are fixed at the one end in the part 1 of the casing andproject from the lower end-face of this part 1. The part 2 of the casinghas bores 4, designed to receive the pins 3 of part 1.

The two parts 1 and 2 0f the casing are knurled on the outer side.

The machine comprises further a threaded cylinder 5 having left-handedthread 6 and right-handed thread 7. All the elements 1, 2, 5 are bored.The parts 1, 2 of the casing have each a bush 8, 9 respectively designedto guide the same on the shaft of the machine-tool (milling-machine).

In order to accommodate the threaded cylinder 5 in the casing, the parts1, 2 of the casing are bored out and have each a guideface 10, saidguide-faces serving for guiding three milling-parts 11,12, 13 whichtogether form a circular millingblade. Each part 11, 12, 13 of themilling blade has a guide-flange 14, the outer diameter of whichcorresponds to the outer diameter of the guide-face 10. The flange 14 ofpart 11 has on one portion of its height a female lefthanded thread 15and that of the part 12 of the milling-blade has on a portion of itsheight a female right-handed thread 16, the flange of part 18 of themilling-blade having an inwardly directed tongue 17. This tongue isaccommodated in an annular groove 18 between the left-handed andright-handed threads 6, 7 of the threaded a cy inder The femaleleft-handed thread 15 of the part 11 of the milling blade engages withthe male left-handed thread 6 of the threaded cylinder,while the thread16 of the part 12 of the milling blade engages with the righthandedthread 7 ofsaid cylinder 5. The flange 14 of each part 11, 12, 13 of thecircular milling blade projects, on the one hand, into the part 1 of thecasing and on the other hand into the part 2 of the casing, the outersurfaces bearing on the ringshaped guide faces 10 of the parts of thecasing. The parts of the milling blade are secured against rotation inthe parts 1, 2 of the casing by the pins 3 onto which these parts bearand are guided on the same by the cut out portion 19. The cylinder 5 isrotatably mounted on the bushes 8, 9 and has two holes 20 designed toreceive the studs of a key not shown in the drawing. 7 At the pointwhere these holes 20 are arranged the cylinder 5 is knurled so that itmay be rotated by hand.

The operation of the tonguingand grooving apparatus described is asfollows As shown in Fig. 1 a narrow groove and a. narrow tongue may beproduced by means of the toguing and grooving apparatus as all parts 11,12, 13 of the circular cutting blade are situated on. the same circularpath. When wider grooves or tongues have to be produced, part 2 of thecasing is lifted off the pins 3, a key is placed on the cylinder 5 andthe cylinder is rotated to the left. The two parts 11, 12 of the millingblade which,

owing to the pins 3, cannot rotate move away in opposite directions theone from the other, the part 13 remaining in its position.

Fig. 2 shows the parts 11, 13 in this position. When each part of themilling blade is 4 mm. thick, tongues and grooves of 4 to 12 mm. may becut with the apparatus. WVhen a second set of thicker cutting blades isused, grooves or tongues up to 45 mm. may be produced. No finishing ofthe tongues and grooves is necessary as they are very accurate andclean. This tonguing and grooving apparatus may be made and sold indifferent sizes. It is adapted to be used for machine tools revolving tothe right or to the left. I Two adjustable spring collars, notshown inthe drawing serve to press the tt'vo parts the 11c chine the one againstthe other and to secure thereby the parts 11, 12, 13 of the cuttingblades in their actual position. At the adjusting or separating of theparts 01 the milling-blade the part 11 bears on the one side on part 1of the casing, the parts 12, 13 being moved away from the part 11 by thethreaded cylinder. The part 13 preserves, however, in any case itscentral position with regard to the otherblades 11, 12.

At suitable points scales and marks may be arranged, so that the parts13, 12, 11 of the milling blade can be rapidly and easily adjusted toany desired width of grooves or tongues.

I claim 1. A tonguing and grooving apparatus by means oi which groovesand tongues of dii"- fe'rent Widths'can be produced accurately andcleanly, comprising in combination a threaded cylinder having letthanded and right-handed threads and a circular groove between saidthreads, a casing in which said cylinder is rotatably mounted, a millingblade composed of three parts, one of said parts engaging with theleft-handed thread another of said parts engaging with the right-handedthread, a projection on the inner surface of the parts and guided insaid circular groove of said threaded cylinder so that by rotating saidcylinder said parts of the milling blade are moved towards and away theone from the other in the axial diguide face, the parts of the millingblade having each a flange projecting towards both sidesand engagingwith said guide face of the casing. V

4. A tonguing and grooving apparatusas specified in claim 1, comprisingin combination with the casing having a ring-shaped guide face, theparts of the milling blade having each a flange projecting towards bothsides and engaging with said guide face of the casing, said flange oftwo of said parts having a iemale thread the third part having a proection engaging with the groove of said cylinder.

5. A tonguing and grooving apparatus as specified 111 clalm 1 1n whichthe casing 1S composed of two parts, pins for connecting I said twoparts of the casing the one with the other and serving further toprevent rotation of the parts of the milling blade.

In testimony whereof I affix my signature.

WILHELM OHNO.

